广西天湖水电站压力管道镇支墩位移监测研究

高水头水电站压力管道及其镇支墩的稳定和安全至关重要，安全监测应以镇支墩位移为主。观测精度指标的选取要依据管道结构本身对镇支墩位移的实际承受能力来确定，在天湖水电站，其观测中误差允许值，镇墩纵向位移取１．６ｍｍ，镇支墩间沉降差取０．４ｍｍ。

STUDING ON THE DISPLACEMENT MONITORING SCHEME OF PRESSURE PIPE IN THE TIANHU HYDROELECTRIC POWER PLANT

The stability and safety of anchorage block and the buttress of pressure pipes in high-head diversion power plant is very important, and the safety monitoring should lay stress on the displacement of anchorage block and the buttress.The selection of observation accuracy index must be determined by the practical supporting capacity of the structure of pipes to the anchorage block and the buttress.The allowable values of the mean square errors in the Tianhu hydroelectric power plant are 1.6 mm in longitudinal displacement and 0.4 mm in differential settlement of anchorage block and buttress under the condition of special site and changeable climate, it is not only economical but also simple and convenient to select collimation line method-with the method of straight traverses of steel tape to measure the longitudinal displacement of anchorage block and buttress. And the influence of the systematic error can also be eliminated in a great quantity.The pre-estimated precision is 1. 1mm with which the EDM can not be compared.